Example of a Strategy pattern that could be used for API calls.

Strategy.java

// Strategy design pattern with API requests, example.
class ApiRequestSender {

    ApiRequestMethod apiRequestMethod;

    public static void main(String[] args) {
        ApiRequestSender apiCategoriesRequest = new ApiRequestSender();
        apiCategoriesRequest.setApiRequestMethod(new CategoriesRequest());
        System.out.println(apiCategoriesRequest.sendRequest("www.spotify.com/endpoint/categories"));

        ApiRequestSender apiNewRequest = new ApiRequestSender();
        apiNewRequest.setApiRequestMethod(new ApiRequestNew());
        System.out.println(apiNewRequest.sendRequest("www.spotify.com/endpoint/new"));
    }

   public void setApiRequestMethod(ApiRequestMethod apiRequestMethod) {
        this.apiRequestMethod = apiRequestMethod;
   }

   public String sendRequest(String request) {
        return this.apiRequestMethod.send(request);
   }
}

interface ApiRequestMethod {
    String send(String request);
}

class CategoriesRequest implements ApiRequestMethod {

    @Override
    public String send(String request) {
        return "Categories JSON";
    }
}

class ApiRequestNew implements ApiRequestMethod {
    @Override
    public String send(String request) {
        return "New JSON";
    }
}